I'm not terribly surprised that colleges are imposing post-spring break quarantines, in effect. Now that the virus is pretty pervasive all over the US as well as abroad, the choice would be to either keep all the kids at school (not possible) or accept that everyone will go home (or wherever) and bring back whatever they were exposed to, which would likely spread like wildfire. Even if the likelihood is pretty low, I can understand how the risk management people are saying its an unacceptable risk. It does completely suck for the students, especially kids that are living on campus, and considering the amount people are paying for instruction.
I'm wondering what our local school district is going to do about the same issue - they can't very well tell everyone they can't travel at all during spring break, unless the CDC comes out and makes that recommendation for everyone. I would guess that more than half the families in my town have some kind of trip planned, whether domestic or international. I wouldn't be surprised if they do 2 weeks of online school after spring break to make sure that anyone who has picked up something nasty has time to find out about it before sending kids back to school. We have a few weeks before break around here, but I'm sure that is on the table.